I agree that better photos are needed and they should be well-focused closeup photos of each object. Meanwhile, it SEEMS like only object #6 is a button.
1- A decorative stud-disc, perhaps from furniture or leather horsegear.
2- Uncertain, it might be an ironbacked button with its loop rusted off -- need better photo.
3- Uncetain, but definitely not button -- need better photo.
4- Its oval shape and odd attachment wire indicates it is from a cufflink.
5- Oval shape indicates it is from a cufflink.
6- Possibly a button from the 1800s -- need better photos.
You asked about their dollar-value. Because you've got only one part of the cufflinks, they're worth only a couple of bucks. Same for the other objects, except if #6 is an 1800s button it could be worth $5.